build: add helpwidget to tests
build: add helpwidget to tests

This should have been part of dd0781895005f6b52b75e66909991c8764706665.

Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui